US4337713A - Invisible stitch hemming for tubular material - Google Patents

Invisible stitch hemming for tubular material Download PDF

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Publication number
US4337713A
US4337713A US06/175,613 US17561380A US4337713A US 4337713 A US4337713 A US 4337713A US 17561380 A US17561380 A US 17561380A US 4337713 A US4337713 A US 4337713A
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United States
Prior art keywords
workpiece
sewing
feeler
straight guide
structure according
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Expired - Lifetime
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US06/175,613
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English (en)
Inventor
Giovanni Palacino
Gianfranco Garzulano
Adelmo Garagiola
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Individual
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Individual
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D05B35/02—Work-feeding or -handling elements not otherwise provided for for facilitating seaming; Hem-turning elements; Hemmers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

Definitions

  • a workpiece guiding device which includes a hemming element that is adapted to fold the marginal portion of the workpiece in the required manner, and a straight guide aligned with the sewing axis which is effective in guiding said workpiece parallel to said sewing axis.
  • the hemming element is usually made so that it will move upwardly away from the hem being formed on tubular material just prior to completion of seaming when the initial portion of the seam again approaches the needle. This feature serves to assist the operator in preventing the sewn portion of the workpiece from again entering the sewing zone.
  • known devices usually include a means for effecting movement of the straight guide in a direction which places it at a greater distance from the sewing axis.
  • the thickness of the workpiece material is frequently subjected to areas of increased thickness which can be attributed to such previous operations such as cross-sewing.
  • the elements comprising the guiding device are maintained in a pre-selected position so that the needle of the machine is caused to pass through the thickness of the margin of the folded material in order that the thread associated with the needle is not visible within the fold when the sewn material is spread out.
  • Actuation of the control means is accomplished automatically by a movable feeler element which engages the material and which is located in a narrow passage provided between the tip of the hemming element and the straight guide.
  • the movable feeler is urged in the direction of the straight guide, against the biasing force of a spring, and arrives at a position to effect actuation of the control means.
  • the control means causes movement of said straight guide in a position where it is temporarily held for a sufficient length of time to permit those portions of the workpiece of increased thickness to reach and pass beyond the needle while maintaining alignment of and the required type of stitching in said workpiece.
  • the spring operatively associated with the movable feeler element is of the light and sensitive type, it still causes a certain amount of resistance to those increased thickness portions of the workpiece as they are caused to advance through the guide and create a greater stretched condition to said workpiece than that which is considered an acceptable amount.
  • the hemming element is essential to effect movement of the movable feeler element and hence the actuation of the control means, this element is not essential in forming the hem in the manner described above, for the operator of the machine manually controls the quantity of marginal material for forming said hem and is the actual creator thereof. Additionally the hemming element presents an undesirable requirement in the sewing cycle, for near the completion of said cycle, said hemming element must be manually displaced so as to prevent the initial portion of the sewn hem from making contact therewith. The procedure of displacing the hemming element necessitates what is considered excessive non-productive time for the operator must stop the sewing in progress and then with one hand displace said hemming element as required.
  • An object of the present invention is to eliminate the above disadvantages by providing a device in which the hemming element is replaced by an element adapted to press the first fold only of the marginal portion of the material on the needle plate and which is disposed so as not to interfere with the passage of the initial portion of the hem already sewn, i.e. such as not to require the direct intervention of the operator.
  • a further object is that of providing the device with a movable feeler element that is extremely sensitive to the presence of increased thicknesses of the workpieces so as to perform its intended function without causing damage to the material to be sewn.
  • the invention defines an invisible stitch hemming device especially adapted for hemming tubular materials which is characterized by the hemming element that defines a substantially horizontal plate having a tip portion that is insertable within the open upper fold of the hem and which is movable out of the upper fold under the thrust of the sewing as the initial sewn portion again approaches the needle.
  • the feeler is disposed so as to project upwardly through the needle plate at a location beneath the tip of the hemming element.
  • FIG. 1 is a perspective view of a portion of a sewing machine showing the device according to the invention applied thereto;
  • FIG. 2 is a top view of the device according to the invention shown in FIG. 1;
  • FIG. 3 is a view in side elevation and partially in section of a portion of the device shown in FIGS. 1 and 2;
  • FIG. 4 is a view of a portion of a workpiece showing the manner of folding to produce a hem and an area of increased thickness defined by cross stitching.
  • the sewing machine to which the invention is applicable includes among its many parts a base 1 on which a worksurface 2 is fixed and a column 3 which overhangs said worksurface and supports the upper well known stitching instrumentalities that include a needle 4 and a presser foot 5 mounted in a known manner to a lever 6 of the machine's presser mechanism not shown.
  • the machine also includes a conventional needle plate 7 having the usual longitudinal openings 8 through which the feed dog (not shown) periodically projects to cooperate with the presser foot 5 and effect advance of a workpiece in a manner well known to those conversant in the sewing art.
  • the machine To trim the edge of the workpiece material the machine is provided with a trimming knife 9 which is caused to function with a reciprocating movement.
  • an invisible stitch hemming device generally indicated by numeral 10 which includes a straight guide 11 (FIG. 2) having a first vertical wall 12 extending parallel to the openings 8 of the needle plate and parallel to the sewing axis 13 that passes through the pathway of the needle 4.
  • the straight guide 11 also includes a second vertical wall 14 connected to and extending at an oblique angle from the first wall 12.
  • the straight guide is pivotably mounted on a bolt 15 that is assembled in a guide 16 that is adjustably mounted on a support 17 which is fixed by screws 18 to the base 1 (FIG. 3).
  • the straight guide is adjusted by means of a knob 19 which is effective in increasing or decreasing the distance between the vertical wall 12 of the straight guide 11 and the sewing axis 13 as is necessary to be certain that the needle only goes through the thickness of a first fold 20 (FIG. 4) of the workpiece 21.
  • the forward end of the straight guide 11 defines a block element 22 on which a substantially horizontal hemmer plate 23 is pivotably attached by means of a vertically extending pin 24.
  • This block element 22 is operatively engaged by one end of a rod 25 whose opposite end is connected to actuator means that according to the preferred embodiment defines an electromagnet 26.
  • This electromagnet 26 is pivotably supported by a bracket member 27 that is fixedly attached to the base of the machine.
  • the hemming device further includes a vertically extending feeler 28, which projects from the worksurface 2 into an area located beneath a tip 29 of the hemmer plate 23 and adjacent an edge formed by the junction of the two vertical walls 12 and 14 which define a passage for advance of a workpiece along the sewing axis.
  • This feeler 28 is pivotably supported as at 30 on a plate 31 that is fixedly attached to the base 1 (FIG. 1) forwardly of the worksurface 2.
  • the feeler 28 extends downwardly from its support and defines a tail piece 32 which is disposed in operative association with a detector element 33 of the proximity sensor or opto-electronic type.
  • This detector element 33 serves to activate the electromagnet 26 so as to vary the position of the vertical wall 12 upon sensing an area of increased thickness in the workpiece and which is depicted by numeral 34 in FIG. 4. More particularly the feeler 28 is located in a position whereat it will be engaged by that portion of the workpiece of increased thickness when the two folds 20 and 35 which will form a part of the hem pass between the worksurface 2 and the tip of the hemmer plate 23.
  • the lower portion of the pin 24 is extended and defines a threaded rod 36 having a knob 37 fixed on its lowermost end and by rotating said knob in one direction or the other, the hemmer plate 23 and its tip 29 can be raised or lowered as desired.
  • the hem as shown in FIG. 4 is so disposed that the first fold 20, or lower fold is pre-formed and inserted between the tip 29 and the worksurface 2 and the second fold 35, or upper fold is superposed on the hemmer plate 23 so that said tip 29 serves as an inner aligning guide for said second fold.
  • the lower fold 20 is in contact with the vertical wall 12 and in alignment with the needle 4 while it is being advanced and the edge portion of the upper fold 35 is disposed so as to be trimmed by the knife 9.
  • the feeler 28 When those portions of the workpiece of increased thickness engage the feeler 28, the latter is pushed downwardly causing an outwardly movement of the tail-piece 32 which effects actuation of the detector element 33 and in turn by means of suitable connections (not shown), activates the electromagnet 26.
  • Actuation of the electromagnet 26 causes rod 25 to pivot the block element 22 in a clockwise direction (FIG. 2) which is effective in displacing the vertical wall 12 in the direction of the indicating arrow A which permits continued advance of that portion of the workpiece of increased thickness along its initial and intended path of travel.
  • the vertical wall 14 is pivoted toward the sewing axis 13 where it becomes aligned with said vertical walls 12 initial position.
  • the feeler 28 returns to its original position after passage of the increased thickness portion of the workpiece, the vertical wall 12 remains in its displaced position until said increased thickness portion has advanced beyond the needle 4, thus causing invisible stitch sewing to be formed in the required way and without misalignment with respect to the fold.
  • the tail-piece 32 of the feeler 28 has a coil spring 38 operatively connected therewith which serves to prevent accidental movement of the feeler as a result of vibrational forces while the machine is operating.
  • the initial portion of the sewing again approaches the needle and before passing the hemming device it contacts the forward edge 29' of the tip 29, and exerts a force which causes the hemmer plate 23 to pivot on the pin 24 in opposition to the biasing force of a return spring 39.
  • the tip 29 is consequently forced out of the upper fold 35 and immediately thereafter returns to the upper surface of the hem until the sewing operation then in progress has been completed.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US06/175,613 1979-09-25 1980-08-06 Invisible stitch hemming for tubular material Expired - Lifetime US4337713A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT25966A/79 1979-09-25
IT25966/79A IT1123314B (it) 1979-09-25 1979-09-25 Dispositivo orlatore a punto invisibile specialmente adatto per l'orlatura di tessuti tubolari

Publications (1)

Publication Number Publication Date
US4337713A true US4337713A (en) 1982-07-06

Family

ID=11218294

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/175,613 Expired - Lifetime US4337713A (en) 1979-09-25 1980-08-06 Invisible stitch hemming for tubular material

Country Status (8)

Country Link
US (1) US4337713A (it)
JP (1) JPS5927595B2 (it)
CH (1) CH642124A5 (it)
DE (1) DE3033186C2 (it)
ES (1) ES8106775A1 (it)
FR (1) FR2465820A1 (it)
GB (1) GB2062030B (it)
IT (1) IT1123314B (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3313766A1 (de) * 1982-09-27 1984-03-29 Yamato Mishin Seizo K.K., Osaka Vorrichtung zum verhindern, dass teile direkt vor und hinter einem stufenteil am seitensaum beim saeumen der unteren stoffkante ungenaeht bleiben
US4729329A (en) * 1985-06-03 1988-03-08 Prouvost S.A. Magnetic detection device for sewing machine workpiece
US4817544A (en) * 1987-08-20 1989-04-04 Union Special Corporation Hemming device with hemming guide and guide member for a sewing machine
US4848256A (en) * 1986-05-26 1989-07-18 Tokyo Juki Industrial Co., Ltd. Workpiece detector for a sewing machine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2521604A1 (fr) * 1982-02-12 1983-08-19 Amf Inc Dispositif pour l'execution automatique des ourlets aux extremites libres des parties tubulaires des vetements
JPS60140997U (ja) * 1984-02-29 1985-09-18 ヤマハ株式会社 ピアノ自動演奏装置のアクチユエ−タ
JPH0339994A (ja) * 1990-06-25 1991-02-20 Yamaha Corp ピアノ自動演奏装置のアクチュエータ
EP0623697A1 (de) * 1993-05-05 1994-11-09 Schips Ag Nähautomation Verfahren und Vorrichtung zum Zuführen von Säumen zum Nähen
CN110670263B (zh) * 2019-10-14 2021-08-27 杰克缝纫机股份有限公司 缝料薄厚模块化检测装置及缝纫机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970017A (en) * 1974-11-11 1976-07-20 Usm Corporation Fabric edge finishing machines
US4098204A (en) * 1975-09-05 1978-07-04 Yamato Mishin Seizo Kabushiki Kaisha Apparatus for stretch-sewing a hem in tubular fabric

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434619A (en) * 1945-11-06 1948-01-13 S Nger Mfg Company Overedge sewing machine
US3936145A (en) * 1974-11-07 1976-02-03 International Telephone And Telegraph Corporation Fiber optic alignment sleeve
JPS5170650A (ja) * 1974-12-16 1976-06-18 Hitachi Ltd Kogakukansatsusochi
US4098201A (en) * 1976-10-18 1978-07-04 Union Special Corporation Method and apparatus for hemming
IT1096663B (it) * 1978-06-15 1985-08-26 Rockwell Rimoldi Spa Apparecchiatura per applicare un elastico ad anello su un indumento tubolare

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970017A (en) * 1974-11-11 1976-07-20 Usm Corporation Fabric edge finishing machines
US4098204A (en) * 1975-09-05 1978-07-04 Yamato Mishin Seizo Kabushiki Kaisha Apparatus for stretch-sewing a hem in tubular fabric

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3313766A1 (de) * 1982-09-27 1984-03-29 Yamato Mishin Seizo K.K., Osaka Vorrichtung zum verhindern, dass teile direkt vor und hinter einem stufenteil am seitensaum beim saeumen der unteren stoffkante ungenaeht bleiben
US4729329A (en) * 1985-06-03 1988-03-08 Prouvost S.A. Magnetic detection device for sewing machine workpiece
US4848256A (en) * 1986-05-26 1989-07-18 Tokyo Juki Industrial Co., Ltd. Workpiece detector for a sewing machine
US4817544A (en) * 1987-08-20 1989-04-04 Union Special Corporation Hemming device with hemming guide and guide member for a sewing machine

Also Published As

Publication number Publication date
ES495288A0 (es) 1981-08-01
CH642124A5 (it) 1984-03-30
FR2465820A1 (fr) 1981-03-27
DE3033186A1 (de) 1981-04-09
IT7925966A0 (it) 1979-09-25
JPS5927595B2 (ja) 1984-07-06
GB2062030B (en) 1983-03-23
DE3033186C2 (de) 1984-09-13
IT1123314B (it) 1986-04-30
ES8106775A1 (es) 1982-04-01
GB2062030A (en) 1981-05-20
JPS5676994A (en) 1981-06-24

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